Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What is the riddle which can be asked all day with a different correct answer each time.

How can you take 2 from 5 and leave 4?

I know a nine-letter word having only one vowel.
Do you ?

What is more useful when it is broken?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

How can you write nineteen in a manner that if we take out one, it becomes twenty?